Grand poobah

//ɡɹænd ˈpuːbɑː// noun, slang

Definitions

Noun
  1. 1
    A person who is important or high-ranking. colloquial, humorous, idiomatic, often

    "He once played golf with the grand poobah of their company."

  2. 2
    Alternative letter-case form of grand poobah. alt-of

    "Grand Poobah/Grand Imperial Poobah of the Loyal Order of Water Buffaloes Lodge No. 26."

  3. 3
    An extremely pompous person. idiomatic, slang

Etymology

From Pooh-Bah, the name of a character in Gilbert and Sullivan's comic opera The Mikado (1885).

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